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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
#include "blapi.h"
#include "secoid.h"
#include "secitem.h"
#include "secerr.h"
#include "ec.h"
#include "ecl-curve.h"
#define CHECK_OK(func) \
if (func == NULL) \
goto cleanup
#define CHECK_SEC_OK(func) \
if (SECSuccess != (rv = func)) \
goto cleanup
/* Copy all of the fields from srcParams into dstParams
*/
SECStatus
EC_CopyParams(PLArenaPool *arena, ECParams *dstParams,
const ECParams *srcParams)
{
SECStatus rv = SECFailure;
dstParams->arena = arena;
dstParams->type = srcParams->type;
dstParams->fieldID.size = srcParams->fieldID.size;
dstParams->fieldID.type = srcParams->fieldID.type;
if (srcParams->fieldID.type == ec_field_GFp ||
srcParams->fieldID.type == ec_field_plain) {
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->fieldID.u.prime,
&srcParams->fieldID.u.prime));
} else {
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->fieldID.u.poly,
&srcParams->fieldID.u.poly));
}
dstParams->fieldID.k1 = srcParams->fieldID.k1;
dstParams->fieldID.k2 = srcParams->fieldID.k2;
dstParams->fieldID.k3 = srcParams->fieldID.k3;
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->curve.a,
&srcParams->curve.a));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->curve.b,
&srcParams->curve.b));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->curve.seed,
&srcParams->curve.seed));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->base,
&srcParams->base));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->order,
&srcParams->order));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->DEREncoding,
&srcParams->DEREncoding));
dstParams->name = srcParams->name;
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->curveOID,
&srcParams->curveOID));
dstParams->cofactor = srcParams->cofactor;
return SECSuccess;
cleanup:
return SECFailure;
}
static SECStatus
gf_populate_params_bytes(ECCurveName name, ECFieldType field_type, ECParams *params)
{
SECStatus rv = SECFailure;
const ECCurveBytes *curveParams;
if ((name < ECCurve_noName) || (name > ECCurve_pastLastCurve))
goto cleanup;
params->name = name;
curveParams = ecCurve_map[params->name];
CHECK_OK(curveParams);
params->fieldID.size = curveParams->size;
params->fieldID.type = field_type;
if (field_type != ec_field_GFp && field_type != ec_field_plain) {
return SECFailure;
}
params->fieldID.u.prime.len = curveParams->scalarSize;
params->fieldID.u.prime.data = (unsigned char *)curveParams->irr;
params->curve.a.len = curveParams->scalarSize;
params->curve.a.data = (unsigned char *)curveParams->curvea;
params->curve.b.len = curveParams->scalarSize;
params->curve.b.data = (unsigned char *)curveParams->curveb;
params->base.len = curveParams->pointSize;
params->base.data = (unsigned char *)curveParams->base;
params->order.len = curveParams->scalarSize;
params->order.data = (unsigned char *)curveParams->order;
params->cofactor = curveParams->cofactor;
rv = SECSuccess;
cleanup:
return rv;
}
SECStatus
EC_FillParams(PLArenaPool *arena, const SECItem *encodedParams,
ECParams *params)
{
SECStatus rv = SECFailure;
SECOidTag tag;
SECItem oid = { siBuffer, NULL, 0 };
#if EC_DEBUG
int i;
printf("Encoded params in EC_DecodeParams: ");
for (i = 0; i < encodedParams->len; i++) {
printf("%02x:", encodedParams->data[i]);
}
printf("\n");
#endif
if ((encodedParams->len != ANSI_X962_CURVE_OID_TOTAL_LEN) &&
(encodedParams->len != SECG_CURVE_OID_TOTAL_LEN) &&
(encodedParams->len != PKIX_NEWCURVES_OID_TOTAL_LEN)) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
return SECFailure;
};
oid.len = encodedParams->len - 2;
oid.data = encodedParams->data + 2;
if ((encodedParams->data[0] != SEC_ASN1_OBJECT_ID) ||
((tag = SECOID_FindOIDTag(&oid)) == SEC_OID_UNKNOWN)) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
return SECFailure;
}
params->arena = arena;
params->cofactor = 0;
params->type = ec_params_named;
params->name = ECCurve_noName;
/* Fill out curveOID */
params->curveOID.len = oid.len;
params->curveOID.data = (unsigned char *)PORT_ArenaAlloc(arena, oid.len);
if (params->curveOID.data == NULL)
goto cleanup;
memcpy(params->curveOID.data, oid.data, oid.len);
#if EC_DEBUG
printf("Curve: %s\n", SECOID_FindOIDTagDescription(tag));
#endif
switch (tag) {
case SEC_OID_ANSIX962_EC_PRIME256V1:
/* Populate params for prime256v1 aka secp256r1
* (the NIST P-256 curve)
*/
CHECK_SEC_OK(gf_populate_params_bytes(ECCurve_X9_62_PRIME_256V1,
ec_field_GFp, params));
break;
case SEC_OID_SECG_EC_SECP384R1:
/* Populate params for secp384r1
* (the NIST P-384 curve)
*/
CHECK_SEC_OK(gf_populate_params_bytes(ECCurve_SECG_PRIME_384R1,
ec_field_GFp, params));
break;
case SEC_OID_SECG_EC_SECP521R1:
/* Populate params for secp521r1
* (the NIST P-521 curve)
*/
CHECK_SEC_OK(gf_populate_params_bytes(ECCurve_SECG_PRIME_521R1,
ec_field_GFp, params));
break;
case SEC_OID_CURVE25519:
/* Populate params for Curve25519 */
CHECK_SEC_OK(gf_populate_params_bytes(ECCurve25519, ec_field_plain,
params));
break;
default:
break;
};
cleanup:
if (!params->cofactor) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
#if EC_DEBUG
printf("Unrecognized curve, returning NULL params\n");
#endif
}
return rv;
}
SECStatus
EC_DecodeParams(const SECItem *encodedParams, ECParams **ecparams)
{
PLArenaPool *arena;
ECParams *params;
SECStatus rv = SECFailure;
/* Initialize an arena for the ECParams structure */
if (!(arena = PORT_NewArena(NSS_FREEBL_DEFAULT_CHUNKSIZE)))
return SECFailure;
params = (ECParams *)PORT_ArenaZAlloc(arena, sizeof(ECParams));
if (!params) {
PORT_FreeArena(arena, PR_TRUE);
return SECFailure;
}
/* Copy the encoded params */
SECITEM_AllocItem(arena, &(params->DEREncoding),
encodedParams->len);
memcpy(params->DEREncoding.data, encodedParams->data, encodedParams->len);
/* Fill out the rest of the ECParams structure based on
* the encoded params
*/
rv = EC_FillParams(arena, encodedParams, params);
if (rv == SECFailure) {
PORT_FreeArena(arena, PR_TRUE);
return SECFailure;
} else {
*ecparams = params;
;
return SECSuccess;
}
}
int
EC_GetPointSize(const ECParams *params)
{
ECCurveName name = params->name;
const ECCurveBytes *curveParams;
if ((name < ECCurve_noName) || (name > ECCurve_pastLastCurve) ||
((curveParams = ecCurve_map[name]) == NULL)) {
/* unknown curve, calculate point size from params. assume standard curves with 2 points
* and a point compression indicator byte */
int sizeInBytes = (params->fieldID.size + 7) / 8;
return sizeInBytes * 2 + 1;
}
if (name == ECCurve25519) {
/* Only X here */
return curveParams->scalarSize;
}
return curveParams->pointSize - 1;
}
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